contextvars-registry

contextvars-registry is an extension for the Python's contextvars module.

In case you are not familiar with Context Variables, they work like Thread-Local storage, but better: they are both thread-safe and async task-safe, have snapshots (all existing vars copied in O(1) time), allowing to run functions/threads/asynctasks in the copied context snapshot.

The contextvars is a powerful module, but its API seems too low-level.

So this contextvars_registry package provides some higher-level additions on top of the standard API, like, for example, grouping ContextVar objects in a registry class, with nice @property-like access:

from contextvars_registry import ContextVarsRegistry

class CurrentVars(ContextVarsRegistry):
    locale: str = 'en'
    timezone: str = 'UTC'

current = CurrentVars()

# calls ContextVar.get() under the hood
current.timezone  # => 'UTC'

# calls ContextVar.set() under the hood
current.timezone = 'GMT'

# ContextVar() objects can be reached as class members
CurrentVars.timezone.get()  # => 'GMT'

That makes your code more readable (no more noisy .get() calls), and it is naturally firendly to typing, so static code analysis features (like type checkers and auto-completion in your IDE) work nicely.

Check out the full documentation

Links

• Read the Docs: https://contextvars-registry.readthedocs.io
• GitHub repository: https://github.com/vdmit11/contextvars-registry
• Python package: https://pypi.org/project/contextvars-registry/